They live amongst us ………

[RedRooster]

The ones I have seen were carbon Fibre spun over an Ali former. Missile end cap technology apparently. 

[Escadrille Ecosse]

It's how carbon fibre fishing rods are made too.

And I have seen it done as a reinforcement on guided missile solid rocket motors and nozzles back in the day when I worked on that stuff.

Fairly common now on tanks and pressure vessels, particularly scuba and breathing apparatus tanks where weight is an issue. Stuff I did my BA training on used composite tanks.

They also have very good heat resistance and I have used composite wound pipes on foam firefighting systems for crude oil storage tanks.

Look up filament winding on YouTube and there are some impressive and almost hypnotic videos of these things being wound.

[DeTRacted]

4 hours ago, Escadrille Ecosse said:

Fairly common now on tanks and pressure vessels, particularly scuba and breathing apparatus tanks where weight is an issue.

Yes but all of those have the fibre in tension where it is strong, because the high pressure is inside.  Beats me how this thing was supposed to operate with the fibre being in compression or shear. It seems it was relying mainly on the strength of the resin binder. 

[Escadrille Ecosse]

24 minutes ago, DeTRacted said:

Yes but all of those have the fibre in tension where it is strong, because the high pressure is inside.  Beats me how this thing was supposed to operate with the fibre being in compression or shear. It seems it was relying mainly on the strength of the resin binder. 

Exactly my point...

6 hours ago, Escadrille Ecosse said:

Compressive forces, especially on slender structures, like the shell of a hollow vessel are much harder to deal with where buckling is as important factor as material properties. And buckling mechanisms are also a lot less deterministic.

Which is true regardless of the material in question.

The thickness of a submarine hull is considerably greater than would be required if the loads could be guaranteed to be absolutely along the major axis of the shell.

Carbon fibre is actually extremely strong in compression. The problem is that it is basically impossible to ensure all the fibres line up exactly to create a completely self reacting load path.

Because of the 'butterfly effect' of compressive loads on hollow structures there needs to be a significant additional thickness allowance to provide the necessary stability assuarance and stop your structure behaving like a mechanism. In a very bad way.

[JohnD]

As a further diversion of this thread, yes, very light gas cylinders!    Oxygen carried by paramedics, or used in hospital to transport patients about.

They are a light aluminium shell, bound with composite, glass fibre I believe, not CF.    In one famous incident, such a cylinder caught fire!   The blast of pure oxygen and flame set a patients bedding alight, and the cubical curtains, and when a heroic nurse knocked it to the floor, the carpets!     ICU evacuated, one burnt patient who died, but no explanation of what happened, except that all are instructed to use said cylinders UPRIGHT.

Several mechanisms have been suggested as the cause of the fire.   Any thoughts from the assembled Common Room of Sideways Uni?

John

References: 

https://associationofanaesthetists-publications.onlinelibrary.wiley.com/doi/10.1111/anae.12089

And the speculative final report: https://associationofanaesthetists-publications.onlinelibrary.wiley.com/doi/full/10.1111/anae.12698

Edited June 29, 2023 by JohnD

[JohnD]

And lurching back again:  https://www.google.com/amp/s/www.bbc.com/news/world-us-canada-66049789.amp

We may know more about what happened, eventually.  The Beeb includes a link to an article discussing the investigation

John

Edited June 29, 2023 by JohnD

[RogerH]

Hi John,

I would have thought the Oxy cylinder would have been wound in Kevlar.

GF is not that strong.  Kevlar is almost indestructible 

 

Roger

[JohnD]

They live among us, but if they fit this, I fear not for long, taking the rest of us with them:

Wireless Carplay & Android Auto Car Play, Portable Car Stereo with Bluetooth, Dash Cam, Backup Camera, 64G TF-Card, 7'' IPS Touchscreen Multimedia Player, GPS Navigation Carplay Screen: Amazon.co.uk: Electronics & Photo

Unbelievably, this is dashcam.   Yes, to be fitted to the dash, so that it can 'see' forwards, and with a screen on the back so that the driver can watch bloody videos!!!!!!!

JOhn

 

[Nick Jones]

Most modern stuff has something like that built in!

[Escadrille Ecosse]

Camera looking behind. 

Just like Captain Scarlet's SPV 

[JohnD]

Yes, Nick, but not for the driver!     Wasn 't there  a screen that showed NetFlix (or whatever) to the passenger and sat nav to the driver?  By cunning uses of Fresnel lenses?

But there are more:  https://www.facebook.com/profile.php?id=100071848307374    It's bad enough that Mr. Casualdriver has a ^%$&^ great SUV to run you over with, without providing him with total distractration, far worse than any mibile phione call.

IT SHOULDN'T BE ALLOWED!

John

[Escadrille Ecosse]

To those living among us. This is excellent..

What have the Romans ever done for us?

[JohnD]

On 8/11/2023 at 3:42 PM, JohnD said:

Yes, Nick, but not for the driver!     Wasn 't there  a screen that showed NetFlix (or whatever) to the passenger and sat nav to the driver?  By cunning uses of Fresnel lenses?

But there are more:  https://www.facebook.com/profile.php?id=100071848307374    It's bad enough that Mr. Casualdriver has a ^%$&^ great SUV to run you over with, without providing him with total distractration, far worse than any mibile phione call.

IT SHOULDN'T BE ALLOWED!

John

Well, in true 'Disgusted, of Lancaster' mode,  I wrote to my MP! And they replied very quickly, and sent my letter to the Minister for Transport (One Richard Holden.  Who he?)   Who replied that it was A/ the drivers responsibility and B/ the Police's responsibility, to fulfil and see fulfilled, Regulation 109 of The Road Vehicles(Construction and  Use) Regulations, that say that drivers may only see on screens about the vehicle or its route.      In other words, "Not my problem, Guv!"

So Tories are happy to see blatantly illegal devices on sale, as well as blatantly unsafe buildings, blatently useless ... oh, you fill in the rest, it makes me  tired

John

[zetecspit]

12 hours ago, JohnD said:

Well, in true 'Disgusted, of Lancaster' mode,  I wrote to my MP! And they replied very quickly, and sent my letter to the Minister for Transport (One Richard Holden.  Who he?)   Who replied that it was A/ the drivers responsibility and B/ the Police's responsibility, to fulfil and see fulfilled, Regulation 109 of The Road Vehicles(Construction and  Use) Regulations, that say that drivers may only see on screens about the vehicle or its route.      In other words, "Not my problem, Guv!"

So Tories are happy to see blatantly illegal devices on sale, as well as blatantly unsafe buildings, blatently useless ... oh, you fill in the rest, it makes me  tired

John

To be fair, the country is littered with stuff that should not be sold. 

Electric "bikes" that don't fit the rules, electric scooters similar plus loads of non-compliant electrical goods. Much of which is sold via ebay and amazon, or "pop up" sellers who disappear when the container load of stuff they bough has sold out. 

I came face to face with a scooterist the other evening, getting dark, me mooching along a road at 30mph  (I am pretty good at sticking to the speed limits in town) when a scooter appeared, wrong side of the road heading towards me at estimated) 30+mph. Rider in black, tiny led lamp at the front. On the plus side such people could be a good source of donor organs, but these zombies seem unlikely to have a long career. On this occasion, I swerved and avoided what would have been a head on collision. 

[Nick Jones]

https://amp.theguardian.com/world/2023/aug/31/rented-e-scooters-cleared-from-paris-streets-on-eve-of-ban
 

Still a few scattered (and I mean scattered) around Yeovil. Getting very battered! Had to drive around the remains of one in the road recently. Its scooting days were definitely over. Didn’t appear to be any human remains with it….

[JohnD]

2 hours ago, Nick Jones said:

Didn’t appear to be any human remains with it….

 

Tha Yeovil scawngers, them'll tek anything.

[JohnD]

This keeps appearing on my Fb feed.  It's a hoodie for your gearstick.

Nurse!  Screens! And a vomit bowl!

[Nick Jones]

On 9/7/2023 at 12:41 PM, JohnD said:

Tha Yeovil scawngers, them'll tek anything.

Yeah, but normally take the scooter, leave the body….

[JohnD]

Just received my online copy of the MotorsportUK journal "Revolution", which contains the Court Reports of various incidents that have led to sanctions being applied to licence holders, and they have appealed to the MUK Court.   Previously they have been as dry as you might expect a Court Report to be, but it appears they have a new writer, as they are quite lively!   As an example, this from a karting case.

Rather fun!

John

Edited November 25, 2023 by JohnD

[JohnD]

But  the editing is a bit loose!    The feature article is about the administrators of several UK race circuits, and includes this picture of my favourite, Krap Yrollam:

(With apologies to the excellent Ms.Hansard!)

John

[Escadrille Ecosse]

On 11/25/2023 at 6:40 PM, JohnD said:

Rather fun!

Most certainly.

Is that Ms. Hansard following in the family tradition?

[JohnD]

Motorsport, or Parliamentary Reports?

[Escadrille Ecosse]

1 hour ago, JohnD said:

Motorsport, or Parliamentary Reports?

Rerefied reporting generally I felt. Hansard is a rather particular name

[JohnD]

This makes me wonder.     You may know of Change.org, a website set up to organise petitions to Parliament, a century-old practice, but one that was made electronic in 2015.    They sent me a general email about a young man who collapsed on the football field and was saved by a defibrillator.  He wanted to have the VAT on defibrillators scrapped as a way to make them more available.   What?   To buy such a life saving device you need to pay an extra 20% in Government tax?   Certainly I'll sign!  Right up  my street, personally and professionally!

Then I went to the Change.org website to see how this petition was going.   To find it, I searched for "defibrillator VAT",  and got SEVEN hits!!  All about VAT on defibrillators!   What is Change.org doing, letting this excellent proposal be so diluted?    Government response depends on the number of signatures.    The "Leadership Team" of Change.org include 26 people, Vice Presidents,  Directors and Managers, who it appears cannot be arsed to get the petitioners to amalgamate their petitions and make then seven times more effective!

JOhn

Edited November 28, 2023 by JohnD

[Escadrille Ecosse]

1 hour ago, JohnD said:

This makes me wonder.     You may know of Change.org, a website set up to organise petitions to Parliament, a century-old practice, but one that was made electronic in 2015.    They sent me a general email about a young man who collapsed on the football field and was saved by a defibrillator.  He wanted to have the VAT on defibrillators scrapped as a way to make them more available.   What?   To buy such a life saving device you need to pay an extra 20% in Government tax?   Certainly I'll sign!  Right up  my street, personally and professionally!

VAT introduced by EEC (as it was then) harmonisation legislation in 1973. As written once applied VAT levels could be changed but not removed and a whole load of rules on what very specific items could be zero rated.

https://en.wikipedia.org/wiki/Value-added_tax_in_the_United_Kingdom

Public use defibrillators would never have been considered before as they didn't exist. And changing the VAT on them will require specific legislation. And it's not like there isn't a mountain of other worthy legislation needing dealt with.

And with a Government that can't even deal with the nonsense legislation it thinks IS important.

1 hour ago, JohnD said:

Then I went to the Change.org website to see how this petition was going.   To find it, I searched for "defibrillator VAT",  and got SEVEN hits!!  All about VAT on defibrillators!   What is Change.org doing, letting this excellent proposal be so diluted?    Government response depends on the number of signatures.    The "Leadership Team" of Change.org include 26 people, Vice Presidents,  Directors and Managers, who it appears cannot be arsed to get the petitioners to amalgamate their petitions and make then seven times more effective!

JOhn

Yeah, and probably separate HR, Sustainability, Diversity and HSE managers/directors too.

I had been signed up to Change.org as I felt it was a useful tool to for applying moral pressure on Government, even though they have few if any morals to pressure.

In the end I got fed up with the mass of 'little Jimmy' type petitions and unsubscribed. A good idea wasted by poor execution and inadequate oversight.

 

Edited November 28, 2023 by Escadrille Ecosse